Safety device for gas-lines.



lUNITED STATES PATENTV OFFICE.

JOHN O. FURMAN, STRATTANVILLE, PENNSYLVANIA, ASSIGNOR OF ONE-V FOURTH TO JAMES W. JONES, OF STRATTANVILLE, PENNSYLVANIA, AND

IRvIN M. sIIANNoN, joFcLARIoN, PENNSYLVANIA.

`SAFETY o'Ev'lcE FOR GAsQLINEs.

SPECIFICATION formingpart of Lettersratent N9, 762,195, dated June 10, 1902.

` Appiimion inea Imm 21,1902. sel-in No. 90,655. (No model.) Y

To all whom t may concern: e, f A

Beit known that L'JOHN C. FURMAN,.a citizen of the United States, and afresident of Strattanville, in the county of Clarion and State of Pennsylvania, -have invented a new and mproved Safety. Device for `Gras-Lines, of which the following is a full, clear, and eX- act description. Y n

The object of the invention is to provide a to new and improved safetydevicefor gas-lines designed to guard Aagainst gasescaping into the house-service pipes in case the flames of the burner have-gone out `owing to lack of gas-supply, the arrangement being such that i5 the line is automatically shutoff in case the gas-pressure fallsbelow a predetermined degree, and the line is keptclosed on recurring full gas-pressure until the Asafety device has been reset manually. I

The invention consists of novel features and parts and combinations of the same, as will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is a5 represented in the accompanying drawings,

forming a part of this specification, in which similar characters of reference indicate corresponding parts in all of the views.

Figure 1 is a side elevation of the improve-'f` 3o ment. Fig. 2 is a longitudinal sectional elevation of the same, and Fig. 3 is a transverse', section of the same on the line 3 3 ofmFig., 2. y The casing A is connected at one endwith the pipe B of the gas-supply main, and the `other end of the casing is connected with the pipe B' for conducting the gas to the burners in the house. Within the casing A is arranged'- a transverse `partition C, provided with a valve-seat D, adapted to be closed by a valve 4o E, held on one end of Va lever F, fulcrumed at F in the partition C and carrying at its other end avalve G, adapted to close a valveseat H, arranged in the wall of the casing A and opening to the atmosphere. By reference to Fig. 2 it will be seen that the lever F extends into both compartments formed by the partition C, it being understood that when the lever F is in the position shown in Fig. 2 the valve-seat D is open to allowr gas to pass 5o from the pipe B through the casing A into the pipe B'. The valve Gis held to its seat H by thegas-pressure within the casing for keeping 1the valve E off its seat as long as the gas-pressure is at or above a predetermined degree;but as soon' as the pressure falls be- 55 low the predetermined degree then the lever F swings by its own weight downward at the end carrying the valveG, so that the latter moves oirits seat H, andthe other end of the lever swings upward to move the valve E 6o against the seat D, thus closing the same. When this takes place, the connection between the pipes B and B is cut off and the valve Eeremains closed on recurring gas-pressure, so that no gas can pass through the casing and .pipe B to the open burners, and consequently the escape of gas into a room is completelyprevented. .The valve-seat H is preferably on top of the casing A, and over it extends a suitable guard I to prevent im- 7o purities from passing into the casing. When the valve H moves from its valve-seat, then the gas whichis in the service-pipe B' can leak out throughthe seat into the atmosphere, thereby avoiding accidents when taking f1t- 75 tings of the service-pipe apart for repairs or other purposes.

It is understood that the valve G is readily held to its seat H by the gas-pressure from within the casing A against the atmospheric 8o Ipre'ssureon top of the valve.

In order to prevent leakage of gas from one compartn'lent to the other through the partition'A O at the opening for the lever F, I prefer, to employ rubber or other elastic washers held against the opposite faces of the partitin over the opening for the lever F, the latter havinga snug fit inthesaid elastic washers.` (See Fig. 2.)

In orderto weight'thelever at the for- 9o ward end to any desired degree-that is, to the pressure within the `casing A--when the valve E is to close, I provide thesaid forward end of the leverwith a screw-rod F2, on which screws a weight F3. I

In order to permit of resetting the lever F to the position shown in Fig. 2, the following device is provided: In the sides of the casing A is journaled a crank-shaft J, provided within the casing A with a crank-arm J', adapted roo to engage the forward orweighted end of the lever F, the said crank-arm being pressed on by a spring J2 to normally hold the crankarm in a lowermost position, as shown in Figs. 2 and 3. The outer end of the crankshaft J is adapted to receive a key, wrench, or other tool to enable the operator to conveniently turn the said crank-shaft to move the crank-arm J in engagement with the lever F, to swing the same upward at its forward end and bring the valve G back to its seat on the valve-seat H, to swing the valve E 0E its seat D and again allow gas to pass from the pipe B through the casing A to the pipe B and to the burners.

It is expressly understood that whenever the pressure of the gas falls below a certain point or ceases altogether then the valve E moves to its seat to shut off the gas from the pipe B and the burners, so that no gas can escape into the room even if the burners are left open and gas under pressure again passes through the pipe B.

Having thus described my invention, I claim as new and desire to secure by Letters PatentA l. A safety device for gas-lines, comprising a casing in the line and having a transverse partition to form two compartments, of which one is connected with the gas-inlet and the other with the gas-outlet, a valve-seat in the said partition to establish communication between the compartments, a valve-seat in the outlet end of the casing and opening to the atmosphere, valves for the said valve-seats, and a connection between the valves to hold one to its seat at the time the other is open, and vice versa, as set forth.

2. A safety device for gas-lines, comprising a casing in the line and having a transverse partition to form two compartments, of which one is connectedwith the gas-inlet and the other with the gas-outlet, a valve-seat in the said partition to establish communication between theV compartments, a valve-seat in the outlet end of the casing and opening to the atmosphere, valves for the'said valve-seats, and a connection between the Valves to hold one to its seat at the time the other is open, and vice versa, the said connection being in the form of a lever weighted at the end carrying the valve for the valve-seat opening to the atmosphere, as set forth.

3. A safety device for gas-lines, comprising a casing in the line and having a transverse partition to form two compartments, of which one is connected with the gas-inlet and the other with the gas-outlet, a valve-seat in the said partition to establish communication between the compartments, a Valve-seat in the outlet end of the casing and opening to the atmosphere, valves for the said valve-seats, a connection between the valves to hold one to its seat at the time the other is open, and Vice versa, and a resetting device under the control of the operator, for engaging the said connection to allow of resetting the valves, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN C. FURMAN.

Vitnesses:

B. F. HURLEY, A. B. FURMAN, Sr. 

